Question

Which of the following carbonyls will have the strongest C—O bond?

• A. \(Mn(CO)_6\)
• B. \(Cr(CO)_6\)
• C. \(V(CO)_6\)
• D. \(Fe(CO)_5\)

Hint:

In metal carbonyls, back-donation from the metal decreases the strength of the C—O bond.

Answer 1

The Correct Option is A

The strength of the C—O bond in carbonyl complexes is influenced by the metal's ability to back-donate electrons. The larger the metal's atomic number, the weaker the C—O bond typically is due to stronger back-donation. Thus, \( \text{Mn(CO)}_6 \) will have the strongest C—O bond.

Step 2: Conclusion.
The correct answer is \( \text{Mn(CO)}_6 \), corresponding to option (a).